Abstract
Strain-controlled off-axis cyclic behavior of unidirectional CFRP laminates at high temperature has been studied.Accuracy of strain control using a mechanical extensometer was evaluated by comparing the results measured with strain gauges, indicating that strain-controlled tests can successfully be achieved. Then, strain-controlled cyclic tests for different strain amplitudes and strain rates were carried out on coupon specimens with different fiber orientations, respectively. Hysteretic stress-strain response was clearly observed for cyclic straining. Hysteretic loops tend to move to compressive stress side, which is similar to cyclic stress relaxation behavior of metallic materials. Such an off-axis cyclic stress response tends to saturate with cyclic straining. The cyclic stress range for each hysteresis that depends on the strain rate of cyclic straining as well as the strain amplitude tends to increase with cyclic straining, suggesting cyclic hardening of the composite.
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